Electrical tuning device.



R. H. MARRIOTT.

ELECTRICAL TUNING DEVICE.

APPLICATION FILED we. 24, 1909.

Patented Dec. 13, 1910.

i l l R. H. MARRIOTT.

ELECTRICAL TUNING DEVICE.

APPLICATION FILED AUG. 24', 1909.

Patented Dec. 13, 1910.

SHEET 2.

3 SHEETS- R. H. MARRIOTT.

ELECTRICAL TUNING DEVICE.

APPLICATION FILED AUG. 24, 1909.

Patented Dec. 13, 1910.

\\ MRW UNITED STATES PAranT run it.

ROBERT E. MARRIOTT, F BROOKLYN, NEW YORK, ASSIGNCR Tfi UNITED WERELESSTELEGRAPH COMPANY, A CORPORATION OF ,MAL'NE.

,ELECTRICAL TUNING 978,606. Specification t tem. PatentedDeo. i910.

Application filed August 2 1909. Serial 514,441.

To all whom it may concern: a view of theframe carrying the movable Beit known that I, Ronnnr H. MARRIOTT, coil shown in Fig. 2. Fig. 8. isanother a citizen of the United States, and a resiview of the partsshown in Fig. 7 with the dent of Brooklyn, Kings c0unty, NeW York,movable coi at right angles to the fixed 5 have invented certain new anduseful Imcoil. Fig. 9. is a cross-section showing anon provements inElectrical Tuning Devices, other form of the invention, in which twoofwhich the followingis' a spec1fication.- coils are carried by themovable frame, in-

My invention relates to tuning devices, stead of one. Fig. 10. is adetail View of and more particularly to tuning devices emthe conductiveguideway for the lower pivot ploying a fixed and a movable coil forvary' pm of the movable frame shown in Figs. 7 65 ing the inductance.and 8. Fig. 11. is a diagram showing the One of the objects of myinvention is to connecting circuit of the coils illustrated in provide avariable inductance for the high- F ig. 9. frequency transmission ofelectrical energy In accordance with the invention,- a fixed formingpart of a tuning device, infwhich coil 1. and a movable coil 2. areconnected in 70 inductance a fixed coil and a movable coil the receivingcircuit of the high frequency are-used, the vsaid coils being capable ofbesystem for the transmission of electrical enin'gwplacedin inductiverelation and being ergy, the particular form of the system conduct-ivelyconnected, and the movable illustrated being one provided with an aerialcoil being provided with means for present- 3. to which the coils areconnected. The ing one side'and then the other to the fixed coils areconnected with ground by means coil, whereby a'variation in theinductanc of a wired. and switch 5. having arms 6 'for tuning isproduced. and 7 connected by cross-bar 8., the ground Another object ofmy invention is to rowire 9 passing through the condenser 10 of vide theapparatus and system descri ed, variable capacity.

with a switching means whereby said fixed The movable coil 2. is carriedon a frame and movable coils may be thrown'in'paral- 1-1. and alwaysremains at one side of the lel or in series, as desired. v face of thefixed coil 1. Means are provided Another ob'ect of my invention is toprofor bodily moving the coil and frame so as 30 vide a simple form. ofmechanism for to alternately present first one side of the .35 actuatingthe frame carrying the movable coil andthen the other to the fixedcoil 1. coil. 7 These means may be varied: In the particu- VVith the.above and other objects in view, lar embodiment of the inventionillustrated, my invention consists in the parts, improvethe frame11.11215 a crank 12 attached therements and combinations more fullypointed to. The. lower end of the cranlr'enters into out hereinafter.the base the lower end turn. 1;; the Referring now tothe drawings whichare base. The upper end M of the or r is pro attached to;thespecification and form a part vided with .handlel so as to thereof:Figure 1. is a diagrammatic illus of the frame. Suitable me 4o 'trationof the system, showing the circuits. videdfor guiding one end oft...

Fig. 2. is a diagrammatic view of the-aerial. it is revolved by thecrank. receiving circuit, containing a fixed coil and pivot pins ll 17,are provided fo a bodily movable, reversible movable coil. pose. Thesepins are secure-d Fig. 3. illustrates one mode of connection of d movein suitable guide-we; W0 A. U

the fixed and movable coils, the coils being in parallel. and thecurrent flowing so as to diminish the self-induction. Fig. a. shows aparallel connection of the coils with the current flowing so as toincrease the selii inductionofthe system. Fig. ,5. shows seriesarrangement of the coils, the curre ride the and insure re flowing so asto tend-to diminish the 'seii:- .me 11." induction. and Fig. 6. shows aseries ar- Snitablemeans'are rangemeniflof coils, the current flowingthe fixed 2 -d 5 as to increase theself-induction. Fig. 7. series. .2

vied wi A a reentrant i .1 5 revises purpose. \Vhen the conductingswitch-arms 6, 7, are on the contact points 21 and '22, as illustratedin F ig. 1., the wires 23 and 4 .will connect the two coils 1 and 2 inparallel.

Vhen the switch 5 has its arms 6 and 7 in contact with theswitch-contacts and 26 (the cont-act 25 being a dead :ontact), the twocoils l and 2 are thrown in series relation. It will be observed that 1and 2 are in inductive relation with each other during the rotationofthe coil 2. i

The local receiving circuit, illustrated in Fig. 1., is likewiseprovided with a fixed coil 27, and a movable coil 28, which coils are ininductive relation. The fixed coil 27 is parallel to and opposite to theface of the fixed coil 1. The two fixed coils 1 and 27 are always ininductive relation and may be separated more or less or brought closetogether to vary this relation, By mounting the movable coils on framesand in such a manner that they always remain at one side .of the face ofthe respective fixed coil, the movable coils do not project beyond theface which permits the fixed coils to'be brought close together. Thefixed coil 27 and the movable coil 28 maybe thrown in parallel or inseries with each other by means of the switch 29 and the arms 30 and 31.These arms cooperate with contact -buttons 32, 33, 34, and 35, thebuttons 32, 33, and being connected with the circuit as indicated. Thepivot points 36 and 37 of the switch are connected by wires 38 and 39 toopposite sides of the detector 40. A condenser 41 of variable capacitymay be connected in the detector circuit, and the telephone 410-, apotentiometer 42 with battery 43 are connected with the circuit at 44and 45 as usual, and a condenser 400 is inserted between the points 44and 45 to prevent the battery from running down.

In accordance with my invention, a manipulation of the switches 5 and 29and a 1'0- tation of the movable coils 2 and 28 results in thearrangement of circuits and fiow of current illustrated in Figs. 3, 4, 5and 6. \Vith the faces of the fixed and movable coils in juxtaposition,and with a parallel connection of the coils, the windings beingconnected as shown in Fig. 3, the self-induction of the coils is reducedto the lowest amount. By rotatin the movable coil and presenting theother side thereof to the fixed coil, without changing the connection,'1'. 0;, without moving a switch, the current flows as shown in Fig. 4,which increases the self-induction.

of the said coils. By throwing the switch and placing the coils inseries, with the current in opposition, the arrangement shown in Fig. 5is secured, with an increase of range in the change of self-inductionover that of Figs. 3 and 4. By rotating the movable coil, stillpreserving the series arrangement, thecurrent will flow as shown in Fig.6, thereby increasing the self-inductionstill further. In other words,the self-induction may. bemade to vary from the amount produced by thearrangement of Fig.3 to that produced by the arrangement in Fig. 6,gradually and by aid of a simple apparatus. By this means the wavelength to which the cirpluit is tuned may be correspondingly varieTurnin now to the apparatus shown in Fig. 9, this differs from the otherfigures in that two coils are carried on the movable frame instead ofone. One of these coils and then the other is presented to the fixedcoil.

The coils on the moving frame are always connected in parallel relation,as indicated in Fi 9.

Reining to Fig. 11, the connections of the apparatus shown in Fig. 9will be apparent. Two apparatuses like those in Fig.

'9 are used. One of them is placed in the aerial circuit and the otherin the local detector circuit. The two coils, 46, 47, on the movableframe have their centers connected as at 48 by a wire from which a wire49 leads to a binding post 50 which is con nected with the detectorcircuit. A branch wire 51 leads from the wire 49 to a switcharm 52. Thetwo outer ends of the coils 46 and 47 are connected at 53, from which awire 54 leads to the outside of the fixed coil 55. The inside of thecoil 55 is connected by means of a wire 56 to contact points 57 and 58of the switch. The outsides of the coils 46 and 47 are also connected bya wire 59 to a switch point 60. The switch point 61 is dead. From switcharm 62 a wire 63 leads to a binding post 64 which is connected with thedetector circuit. By the above set of switches and connection, the fixedand movable coils may be thrown in series or in parallel relation witheach other. A condenser 65 of variable capacity may be connected between50 and 64 in a well known manner. To the terminals 50 and 64 may beconnected a detector circuit including a detector 66, a condenser offixed capacity 67, a potentiometer 68, (the latter supplied with currentfrom a battery 69) and tele hone receiver 70. The antenna circuit incudes the antenna 71- which is connected to binding post 7 2 which isconnected by wire 7 3 to inside of-fixed coil 74 and by wire 75 toswitch arm 7 6. The outside of coil 74 is connected by wire 77 to theoutsides of the coils 78 and 79. A branch wire 80 leads from the wire 77to switch point 81. The insides of coils 78 and 7 9 are connected, fromwhich connection, wire 82leads to switch points 83 and 84. Switch arm 85connects by means of wire 86 to one side ofa -v-ariable condenser 87,the other side of which is connected to ground by wire 88. Switch point89 is dead. The fixed and movable coils of the antenna circuit may thusbe thrown in series or in parallel. It

will be observed that the movable coils 46 and 47 are wound in the samedirection and the movable coils 78 and 79 are wound in the samedirection. Moreover, the inductive "effect of the movable coils on theircorre sponding fixed coil is either additive or subtractivein accordancewith the movement of 'the frame carrying the movable coils. Byseparating the fixed coils, the inductive action of the antenna circuiton the detector circuit may be varied.

Having thus described an embodiment of my invention, it will be obviousthat many changes may be made in itsform without departing from theprinciple thereof.

Claims:

' 1. A tuning device for the high frequency transmission of electricalenergy, comprisin a fixedcoil, a movable coil, said fixed an movablecoils being in inductive relation, and means for bodily moving themovable "coil so as to alternately present one side and then the otherto the fixed coil, said movable coil being arranged at all times at oneside of the face of the fixed coil.

2. A .tuning device for the high frequency transmission of electricalenergy, comprising a fixed coil, a frame, a movable coil secured to oneside of said frame, said fixed and movable coils bein in inductiverelation,

. and means for bodily moving the frame so as toalternately present oneside of the coil and then the other to the fixed coil, said movable coilbeing arranged at all times at one side of the face of the fixed coil.

3. Atuning device for the high frequency transmission of electricalenergy, comprisin a fixed coil, a movable'coil, said fixed an movablecoils being in inductive relation, a switch for throwing said fixed'andmovable coilsin parallel, and means for bodily moving the movable coilso as .to alternately present one side and then the other to thefixed'coil, said movable coilbein arranged at all times at one side ofthe ace of the fixed coil.

4. A tuning device for the high frequency transmission of electricalenergy, comprising a fixed coil, a movable coil, said fixed and movablecoils being in inductive relation, switching means for throwin saidfixed and movable coils. in parallel an in series with each other, andmeans for bodily moving the movable coil so as to'alternately presentone side and then the other to the fixed coil.

5. A tuning device for the high frequency transmission of electricalcner comprising a fixed coil, a movable coil, said fixed and movablecoils being in inductive relation, said movable coil being arranged atall times at one side of the face of the fixed coil, a frame to whichsaid movable coilis secured, and a crank attached to said frame wherebysaid frame may be moved to alternately present one side of the movablecoil and then the other to the fixed coil.

'6. A tuning device for the high frequency transmission of electricalenergy, comprising a fixed coil, a movable coil, said fixed and movablecoils being in inductive relation, said movable coil being arranged atall times at one side of the face of the fixed coil, ,a frame on whichthe movable coil is secured, a crank attached to said frame, and guidingmeans for said frame, the parts being so constructed and arranged thatone side and then the other of the movable coil may be presented to thefixed coil.

7. A tuning device for the high frequency transmission of electricalenergy, comprising a fixed coil, a movable coil,'said fixed and movablecoils being in inductive relation, said movable coil bein arranged atall times at one side of the ace of the fixed coil, a frame on which themovable coil is secured, a crank attached *to said frame, a pivot forsaid frame, .iand a conducting guideway for said pivot, the parts beingso constructed and arranged that one side and then the other of themovable coil may be presented to the fixed coil.

8. A tuning device for the high frequency transmission of electricalenergy,compris'ing a pair of fixed coils, said fixed coils having theirfaces in'inductive relation and opposite to each other, a pair ofmovable coils, one for each fixed coil, each movable coil being ininductive relation with the corresponding fixed coil, each movable coilbeing at all times arranged at one side of the face of the correspondingfixed coil, and means for bodily moving each movable coil to alternatelypresent one side and then the other to the corresponding fixed coil.

9. A tuning device for the transmission of electrical energ of hi hfrequency comprisin a pair of xed 001 5, each consisting of a fiatspiral mounted on a frame, said fixed coils having their faces ininductive relation and opposite to each other, and capable of beingmoved toward and from each other to vary the inductive action, a pair Iof movable coils, each consisting of a fiat spiral, each movable coilbeing in inductive relation with the corresponding fixed coil and eachmovable coil bein ranged at one side of the ace of the correspondingfixed coil and means for moving each of said movable coils toward andfrom the corresponding fixed coil.

In testimony whereof, I have signed my at all times arname to thisspecification, in the presence of two subscribing witnesses.

ROBERT H. MARRIOTT.

Witnesses:

W. C. MARGESON, W. F. BISSING.

